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Income tax payables, income tax assets and deferred income tax - Temporary differences (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Temporary differences |  |  |
Total deferred tax liabilities, net | $ (48) | $ (569) |
Total income tax assets | 626 | 680 |
Included in other comprehensive income | 403 | 263 | $ 257
Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 1,021 | 774 |
Total deferred tax liabilities | (1,169) | (560) |
Total deferred tax assets, net |  | 214 |
Total deferred tax liabilities, net | (148) |  |
Actions for recourse tax receivable | 774 | 466 |
Total income tax assets | 626 | 680 |
Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 1,018 | 771 |
Total deferred tax liabilities | (1,168) | (560) |
Total deferred tax assets, net |  | 211 |
Total deferred tax liabilities, net | (150) |  |
Actions for recourse tax receivable | 774 | 466 |
Total income tax assets | 624 | 677 |
Income Tax Assets, Net, Noncurrent | Telecom USA |  |  |
Temporary differences |  |  |
Total deferred tax assets | 3 | 3 |
Total deferred tax liabilities | (1) |  |
Total deferred tax assets, net | 2 | 3 |
Total income tax assets | 2 | 3 |
Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax assets | 41 | 570 |
Total deferred tax liabilities | (89) | (1,139) |
Total deferred tax liabilities, net | (48) | (569) |
Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 540 |
Total deferred tax liabilities |  | (1,095) |
Total deferred tax liabilities, net |  | (555) |
Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax assets | 41 | 30 |
Total deferred tax liabilities | (89) | (44) |
Total deferred tax liabilities, net | (48) | (14) |
Allowance for doubtful accounts | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 255 | 88 |
Allowance for doubtful accounts | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 252 | 86 |
Allowance for doubtful accounts | Income Tax Assets, Net, Noncurrent | Telecom USA |  |  |
Temporary differences |  |  |
Total deferred tax assets | 3 | 2 |
Allowance for doubtful accounts | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax assets | 6 | 287 |
Allowance for doubtful accounts | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 271 |
Allowance for doubtful accounts | Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax assets | 6 | 16 |
Provisions | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 504 | 341 |
Provisions | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 504 | 341 |
Provisions | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 149 |
Provisions | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 149 |
PP&E | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 1 |
PP&E | Income Tax Assets, Net, Noncurrent | Telecom USA |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 1 |
PP&E | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax assets | 33 | 13 |
PP&E | Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax assets | 33 | 13 |
Inventory | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 62 |  |
Inventory | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 62 |  |
Inventory | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 120 |
Inventory | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax assets |  | 120 |
Pension and termination benefits | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 162 | 139 |
Pension and termination benefits | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 162 | 139 |
Deferred revenues | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 32 | 85 |
Deferred revenues | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 32 | 85 |
PP&E and Intangible assets | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (971) | (560) |
PP&E and Intangible assets | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (970) | (560) |
PP&E and Intangible assets | Income Tax Assets, Net, Noncurrent | Telecom USA |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (1) |  |
PP&E and Intangible assets | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (789) |
PP&E and Intangible assets | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (789) |
Cash dividends from foreign companies | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (129) |  |
Included in other comprehensive income | 46 |  |
Cash dividends from foreign companies | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (129) |  |
Cash dividends from foreign companies | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (64) | (194) |
Cash dividends from foreign companies | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (150) |
Cash dividends from foreign companies | Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (64) | (44) |
Mobile handsets financed sales | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (69) |  |
Mobile handsets financed sales | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (69) |  |
Mobile handsets financed sales | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (84) |
Mobile handsets financed sales | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (84) |
Tuves Paraguay's Deferred tax liabilities, net | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (25) |  |
Tuves Paraguay's Deferred tax liabilities, net | Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax liabilities | (25) |  |
Investments | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (4) |
Investments | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (4) |
Other | Income Tax Assets, Net, Noncurrent |  |  |
Temporary differences |  |  |
Total deferred tax assets | 6 | 120 |
Other | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax assets | 6 | 120 |
Other | Deferred Tax Liabilities, Net |  |  |
Temporary differences |  |  |
Total deferred tax assets | 2 | 1 |
Total deferred tax liabilities |  | (68) |
Other | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax liabilities |  | (68) |
Other | Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax assets | 2 | $ 1 |
Reversals from Affidavit filings | Income Tax Assets, Net, Noncurrent | Telecom Argentina |  |  |
Temporary differences |  |  |
Total deferred tax liabilities, net | (3) |  |
Reversals from Affidavit filings | Deferred Tax Liabilities, Net | Personal |  |  |
Temporary differences |  |  |
Total deferred tax liabilities, net | (11) |  |
Currency translation adjustments | Deferred Tax Liabilities, Net | Nucleo |  |  |
Temporary differences |  |  |
Total deferred tax liabilities, net | $ (2) |  |

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